This results after
a number of generations in the physical degradation of that part of the
human race which inhabits malarious countries.
We cannot, therefore, in the future, count upon the assistance of external
natural forces to increase the power of resistance of human society
against the assaults of malaria. Such an object can be obtained only by
artificial means. It has been sought to attain this end by the daily
administration of the salts of quinine, of the salicylates, and of the
tincture of eucalyptus, each and every one tried in turn. But the salts of
quinine are dear, exercise a prompt, though very transient anti-malarial
action, and, when administered for a long time, disturb rather seriously
the functions of the digestive and nervous systems. The salicylates, when
well prepared, are rather dear, and there is as yet no proof that they
possess prophylactic powers against malaria. The alcoholic tincture of
eucalyptus is useful in malarious regions (as are all the alcoholics,
beginning with wine) in quickening the circulation of the blood; may it,
perhaps, also act as a preservative against light attacks of malaria?
Possibly. But it is very certain that it possesses no efficacy in places
where malaria is severe.
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